you can try this python lib
https://github.com/bhaskar-anil429/MCP9600/blob/master/MCP9600.py
or this c
https://github.com/bhaskar-anil429/MCP9600/blob/master/MCP9600.c
You can replace i2c read write with onion syntax.

@Zachary-Haslam
We have a guide to this setup in our Starter Kit experiments. Check out https://docs.onion.io/omega2-starter-kit/starter-kit-controlling-an-lcd-screen.html to learn how to read a 1-Wire temperature sensor and display it on a 16x2 LCD screen!
Gabe

Little update: for now I'm trying just to connect a light sensor read the data with i2ctools
The i2c sensor is a BH1750FVI, I'm able to retrieve the address ( 0x23 ) with i2cdetect but if I try to look for some data with i2cdump there are all zeros...I've tried to put the sensor under a light or in the dark, nothing changed.
Any guess?